Ostensibly serving to restrict contact with disease vectors, humans exhibit aversion toward cues heuristically inferred as pathogenic. This restriction could lead perceivers to downregulate their interest in food consumption, even if such cues may not connote actual disease threats. This proclivity to avoid disease led us to consider how heuristic disease cues inform interest in foods. Participants evaluated a hypothetical food preparer that varied in the presence of heuristic cues to disease transmission (i.e., physical deformities versus healthy control). Individuals with low levels of perceived infectability were more discerning of the social target as a function of disease cues, whereas heightened levels of this trait fostered an overall aversion to targets regardless of health status. Results provide continued evidence for how pathogen avoidance motives compete with other somatic motives.

Internet access has become a fundamental component of contemporary society, with major impacts in many areas that offer opportunities for new research insights. The search and deposition of information in digital media form large sets of data known as digital , which can be used to generate structured data, representing repositories of knowledge and evidence of human culture. This information offers opportunities for scientific investigations that contribute to the understanding of human behavior on a large scale, reaching human populations/individuals that would normally be difficult to access. These tools can help access social and cultural varieties worldwide. In this article, we briefly review the potential of these in the study of human behavior. Therefore, we propose Culturomics of Human Behavior as an approach to understand, explain, and predict human behavior using digital .

Risk taking is more commonly shown by males than females and has a signalling function, serving to advertise one's intrinsic quality to prospective mates. Previous research has established that male risk takers are judged as more attractive for short-term flings than long-term relationships, but the environmental and socioeconomic context surrounding female preferences for male risk takers has been overlooked. Using a survey instrument, we examined female preferences for male risk takers across 1304 females from 47 countries. We found preferences for physical risk takers to be more pronounced in females with a bisexual orientation and females who scored high on risk proneness. Self-reported health was positively associated with preferences for high risk takers as short-term mates, but the effect was moderated by country-level health, i.e. the association was stronger in countries with poorer health. The security provided by better health and access to health care may allow females to capitalise on the genetic quality afforded by selecting a risk-prone male whilst concurrently buffering the potential costs associated with the risk taker's lower paternal investment. The risk of contracting COVID-19 did not predict avoidance of risk takers, perhaps because this environmental cue is too novel to have moulded our behavioural preferences.

Responses to COVID-19 public health interventions have been lukewarm. For example, only 64% of the US population has received at least two vaccinations. Because most public health interventions require people to behave in ways that are evolutionarily novel, evolutionary psychological theory and research on mismatch theory, the behavioral immune system, and individual differences can help us gain a better understanding of how people respond to public health information. Primary sources of threat information during the pandemic (particularly in early phases) were geographic differences in morbidity and mortality statistics. We argue that people are unlikely to respond to this type of evolutionarily novel information, particularly under conditions of high uncertainty. However, because individual differences affect threat perceptions, some individual differences will be associated with threat responses. We conducted two studies (during Phase 1 and 2 years later), using data from primarily public sources. We found that state-level COVID-19 morbidity and mortality rates had no relationship with mental health symptoms (an early indicator of how people were responding to the pandemic), suggesting that people-in general-were not attending to this type of information. This result is consistent with the evolutionary psychological explanation that statistical information is likely to have a weak effect on the behavioral immune system. We also found that individual differences (neuroticism, IQ, age, and political ideology) affected how people responded to COVID-19 threats, supporting a niche-picking explanation. We conclude with suggestions for future research and suggestions for improving interventions and promoting greater compliance.

Memory plays an important role in the behavioral immune system (BIS; Schaller in , (2), 96-101, 2016a), a proactive immune system whose ultimate function is to make organisms avoid sources of contamination. Indeed, it has been found that objects presented next to sick people are remembered better than objects shown next to healthy people-representing a contamination effect in memory. In the present studies, we investigated this memory effect in relation to "pseudo-contaminated" sources, that is to say, people exhibiting cues ultimately evoking the threat of contamination but objectively posing no such threat in terms of disease transmission. Common objects were shown next to photographs of people having three kinds of morphological deviations-obesity (study 1), scars and burns (study 2), strange eyes (study 3)-or no morphological deviation. Contrary to our expectations, we found that "pseudo-contaminated objects" were not remembered better than "non-contaminated objects," whereas discomfort ratings of the idea of touching the same objects were clearly higher with morphologically deviant people. Memory mechanisms do not seem to be mobilized by "pseudo-contamination" sources which are not directly related to infection risk.

The adaptive memory framework posits that human memory is an evolved cognitive feature, in which stimuli relevant to fitness are better remembered than neutral stimuli. There is now substantial evidence that processing a neutral stimulus in terms of its relevancy to an imagined ancestral survival scenario enhances recall, although there is still disagreement concerning the proximate mechanisms responsible for this effect. Several other mnemonic biases have recently been discovered that similarly appear to reflect evolutionary pressures, including a bias to remember items relevant to an imagined parenting scenario. We tested the generality of this parent processing effect by varying the biological relatedness of the imagined child. We also varied the biological relatedness of a child during an imagined third-person survival processing scenario. Across four experiments, we found evidence that simply altering the described biological relatedness of a child in the parenting scenario and third-person survival processing scenario can affect recall, such that items are better remembered when made relevant to a biological child compared to an adopted child. How these findings inform the general adaptive memory framework is discussed.

We used a Euclidean algorithmic method of calculating mate value discrepancies to test the hypothesis that mate value discrepancies would mediate a negative association between the Dark Triad and relationship satisfaction. Participants ( = 211) rated themselves, their partner, and their ideal partner on a set of traits known to be important in mate selection. They also completed Dark Triad and relationship satisfaction measures. We found an indirect, negative association between the Dark Triad and relationship satisfaction mediated by the Partner-Potential Partner mate value discrepancy. The higher on the Dark Triad, the more alternative partners there were that were closer to the participant's ideal mate preferences than their current partner, which was associated with decreased relationship satisfaction. This study contributes to our understanding of how the Dark Triad relates to mating psychology. These findings also highlight the utility of employing a Euclidean algorithm to understand associations between individual differences and relationship outcomes.

Humans have evolved perceptual acuity toward environmental cues heuristically associated with communicable disease that elicits an aversion. One heuristic cue that humans utilize to infer contamination threat is ingroup-outgroup status, with prejudices arising toward outgroup members due to potential novel pathogen exposure. The current study sought to investigate how disease responses in the US population have been modulated by the COVID-19 pandemic, given its origins in China, an outgroup population. We predicted that participants expressing heightened perceived vulnerability to disease and greater levels of conservatism would report higher levels of aversion towards targets not wearing a mask, particularly among Asian targets, given the association of COVID-19 with Asian populations. Results indicate that conservative individuals were more comfortable with both Asian and White targets if they were not wearing a mask, particularly male targets. We contextualize these findings by identifying how mask-wearing during the pandemic could be more communicative of one's coalitional affiliation rather than a protective health measure for more conservative persons.

Given the persistent threat posed by infectious disease throughout human history, people have a sophisticated suite of cognitive and behavioral strategies designed to mitigate exposure to disease vectors. Previous research suggests that one such strategy is avoidance of unfamiliar outgroup members. We thus examined the relationship between dispositional worry about disease and support for COVID-19-related travel bans across three preregistered studies ( = 764) conducted at the outset of the pandemic in the United States and Singapore. Americans higher in Perceived Infectability were more supportive of travel bans, whereas Singaporeans higher in Germ Aversion were more supportive of travel bans. In Study 2, priming saliency of the pandemic increased support for travel bans from high (but not low) pandemic-risk countries. This prime did not increase general xenophobia. These results are consistent with threat-specific perspectives of outgroup avoidance, and provide an ecologically-valid test of the implications of perceived disease threat for policy-related attitudes and decision-making.

The behavioral immune system (BIS) is an evolved psychological mechanism that motivates prophylactic avoidance of disease vectors by eliciting disgust. When felt toward social groups, disgust can dampen empathy and promote dehumanization. Therefore, we investigated whether the BIS facilitates the dehumanization of groups associated with disease by inspiring disgust toward them. An initial content analysis found that Nazi propaganda predominantly dehumanized Jews by portraying them as disease vectors or contaminants. This inspired three correlational studies supporting a Prophylactic Dehumanization Model in which the BIS predicted disgust toward disease-relevant outgroups, and this disgust in turn accounted for the dehumanization of these groups. In a final study, we found this process of prophylactic dehumanization had a downstream effect on increasing anti-immigrant attitudes during the COVID-19 pandemic. However, consistent with the evolutionary logic of a functionally flexible BIS, this effect only occurred when the threat of COVID-19 was salient. The implications of these results for the study of dehumanization and evolutionary theories of xenophobia are discussed.

Sexual strategies theory indicates women prefer mates who show the ability and willingness to invest in a long-term mate due to asymmetries in obligate parental care of children. Consequently, women's potential mates must show they can provide investment - especially when women are seeking a long-term mate. Investment may be exhibited through financial and social status, and the ability to care for a mate and any resulting offspring. Men who care for children and pets (hereafter "dependents") are perceived as high-quality mates, given that dependents signal an ability to invest; however, no studies have examined how dependents are associated with short-term and long-term mating strategies. Here, online dating profiles were used to test the predictions that an interactive effect between sex and mating strategy will predict displays of dependents, with long-term mating strategy predicting for men but not women. Moreover, this pattern should hold for all dependent types and, due to relative asymmetries in required investment, differences will be strongest regarding displays of children and least in non-canine pets. As expected, men seeking long-term mates displayed dependents more than men seeking short-term mates, but both men and women seeking long-term mates displayed dependents similarly. This pattern was driven mostly by canines. These findings indicate that men adopting a long-term mating strategy display their investment capabilities more compared to those seeking short-term mates, which may be used to signal their mate value.

The COVID-19 pandemic caught the world by surprise and raised many questions. One of the questions is whether infectious diseases indeed drive fast life history (LH) as the extent research suggests. This paper challenges this assumption and raises a different perspective. We argue that infectious diseases enact either slower or faster LH strategies and the related disease control behavior depending on disease severity. We tested and supported the theorization based on a sample of 662 adult residents drawn from all 32 provinces and administrative regions of mainland China. The findings help to broaden LH perspectives and to better understand unusual social phenomena arising from the COVID-19 pandemic.

Pathogen avoidance has been linked to biases against various groups of people, including ethnic outgroups. The present research explored how a non-hypothetical pathogen threat associated with a specific foreign ecology may differentially prompt biases against different ethnic groups. Two studies used an experimental design to examine how the salience of the COVID-19 threat (in early 2020, before COVID-19 was labeled a pandemic) affected perceptions of targets from different racial groups. Study 1 ( = 375; Prime Panels) found that participants in the COVID-19 threat condition, compared to those in the non-pathogen threat condition, perceived all social targets to be more contagious, with the effect being stronger for Asian targets relative to Latino, Black, and White targets. Study 2 ( = 167; undergraduate sample) found that participants in the COVID-19 threat condition, compared to those in the non-pathogen threat condition, were more likely to categorize Asian (but not Latino, Black, or White) targets as outgroup members in a modified minimal group paradigm. Data suggest that the patterns of biases prompted by pathogen avoidance may dynamically change depending on salient heuristic associations.

Among four proposed origins of individualism-collectivism, modernization theory, rice versus wheat theory, climato-economic theory, and pathogen stress theory, the latter has gained more attention in cross-cultural and evolutionary psychology. Since the parasite stress theory of values and sociality makes a connection between infectious diseases and cultural orientations, it gained even more popularity during the COVID pandemic. But despite extensive research on parasite stress theory, it is not still clear what kind of infectious disease contributes more to the emergence of cultures, what are the possible mechanisms through which pathogenic threat gives rise to cultural systems, and how parasite stress might affect vertical vs. horizontal dimensions of individualism-collectivism. This review summarizes and integrates major findings of parasite stress theory related to individualism-collectivism and its closely related variables and discusses future directions that researchers can take to answer the remaining questions.

Sexual coercion-pursuit of sexual activity with a partner who has not provided full consent (Huppin & Malamuth, Sexual Coercion, Hoboken, New Jersey, 2015) is a pervasive problem that carries psychological and financial costs. Although much past research has focused on sexually coercive acts performed by men and directed at women, the current work evaluates the independent and interactive roles of participant gender, desired partner gender, and sexual orientation in predicting individuals' views toward sexual coercion, a psychological outcome linked with coercive sexual behavior (e.g., Zinzow & Thompson in Archives of Sexual Behavior, 44:213-222, 2015). To this end, 1021 cisgender men and women (  = 26.46 years) who self-identified as heterosexual, gay/lesbian, or bisexual rated the acceptability of sexually coercive behaviors performed by individuals of their gender. Consistent with past behavioral research, men rated these acts to be more acceptable when performed by same-gender others than did women. Extending past research, this gender difference was observed across variation in desired partner genders and sexual orientations. Further, an attraction to women predicted higher acceptability ratings among men but not among women. Finally, identification as heterosexual (as compared to gay/lesbian or bisexual) predicted more favorable views toward these behaviors across participant gender. Taken together, these findings suggest that men who are attracted to women (specifically) may be most likely to view coercive behaviors as acceptable, and thus may be most likely to utilize them, when pursuing sexual activity.

Pathogen avoidance is an important motive underlying human behavior and is associated with numerous psychological processes-including biases against social groups heuristically associated with illness. Although there are reliable measurement scales to assess chronic dispositional levels of pathogen avoidance, no measurement scale currently exists to directly assess moment-to-moment fluctuations in pathogen avoidance. This paper presents the Situational Pathogen Avoidance (SPA) scale, which assesses situational variability in pathogen avoidance, especially as it pertains to avoidance of social stimuli. Across six studies, we demonstrate the reliability and validity of the SPA scale, show that the scale is influenced by situational activation of pathogen avoidance motives, and demonstrate that it mediates the association between pathogen avoidance motives (both chronic and situational) and social biases against obese and foreign targets. The SPA scale provides a valuable measurement tool for researchers who study pathogen avoidance and to those who study social biases more generally.

Despite the adaptive advantages of social affiliation in humans, the benefits of interpersonal contact are nonetheless bounded. The experience of crowding can emerge from an oversaturation of social affiliation, fostering avoidant behaviors and heightening vigilance toward interpersonal threats. Among these features indicative of threat includes facial structures connoting dark personality traits associated with a proclivity toward exploitative behavior. Despite the potential costs imposed by those exhibiting these features, individuals could nonetheless enjoy coalitional benefits from exploitative humans (i.e., protection). Two studies investigated whether crowding would foster aversion or interest toward facial structures connoting psychopathy and narcissism. Although crowd salience heightened tolerance for psychopathy (Study 1), providing evidence for a bodyguard hypothesis, narcissism was similarly aversive regardless of motivational state (Study 2). We frame results from an evolutionary perspective and provide tentative explanations for discrepant signal values through psychopathy and narcissism that could elicit disparate findings.

Models of radicalization have typically placed grievances at the heart of radicalization. In contrast, we argue that viewing the radicalizing agent as decidedly , and less reactive, better accounts for the available data. At the core of our radicalization model is the functional structure of envy. The operative properties of the emotion align with essential and conspicuous features of the radicalization process: a motivation to monitor social differentials, an identification of sources of postulated welfare costs, an impulse to eliminate or depower purported competitors, an attempt to diffuse responsibility for one's aggressive actions, and the rejoicing at the envied agent's misfortune. Two of those operative properties are particularly important for our understanding of radicalization. Envy motivates the neutralization of competitors when responsibility for welfare costs is not objectively attributable to others' wrongdoing toward the party who feels injured. The "process of typification" serves as a means to diffuse responsibility. It extends the reach of individual concerns by downplaying the particulars of the personal situation motivating the envious agent while evoking universally shared interaction templates (e.g., humiliation, injustice) to appeal to a broader audience.